I’m not sure what stereotype you’re referring to, but the length of Harry’s surname reads to me as almost a parody of the inclination to signal egalitarianism. I take it as evidence that his adopted parents (particularly the father) are Very Liberal, but that’s all.
In countries with an aristocratic tradition, upper class people tend to have multiple middle names and surnames to better show off all the prominent families the person descends from.
In countries with an aristocratic tradition, upper class people tend to have multiple middle names and surnames to better show off all the prominent families the person descends from.
This tends not to be done in Britain. (Hyphenation does appear at all social strata to some degree.)